Pete,

You might try one of these:
https://www.amazon.com/CableMax-RS-232-link-Tester-Female/dp/B004OT995U/ref=sr_1_3?dchild=1&keywords=serial+port+tester&qid=1626916237&sr=8-3

It will tell you if the serial output of the KIO3B is working.

73,
-de John NI0K rural Debs, MN

[email protected] wrote on 7/21/2021 7:59 PM:
Is there a way to test this board?  I suspect mine has bitten the dust
because it's no longer sending frequency data via cat line to my amp.

Pete Chamalian, W1RM

[email protected]

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